person3 = {'Name': 'Ford Prefect',
           'Gender': 'Male',
           'Occupation': 'Researcher',
           'Home Planet': 'Betelgeuse Seven'}

print(person3['Home Planet'])
print(person3['Name'])
# 结果 Betelgeuse Seven
# 结果 Ford Prefect

person3['Age'] = 33
print(person3)
# 结果
# {'Name': 'Ford Prefect', 'Gender': 'Male', 'Occupation': 'Researcher', 'Home Planet': 'Betelgeuse Seven', 'Age': 33}
